Where is the plate boundary located that separates the South American and Africa

Question

Where is the plate boundary located that separates the South American and African plates?

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Question 22.5 pts

What type of plate boundary is this?

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Question 32.5 pts

Where do the earthquakes in the Atlantic Ocean occur?

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Question 42.5 pts

Are these earthquakes relatively shallow or deep?

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Question 52.5 pts

What is the approximate age of the crust at the plate boundary at the Mid Atlantic Ridge?

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Question 62.5 pts

Describe how the sea floor age changes as you go from the Mid Atlantic Ridge towards the east coast of South America.

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Question 72.5 pts

Describe the relationship between sea floor age, bathymetry, and the mid-Atlantic boundary.

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Question 82.5 pts

Is crust being created or destroyed at this plate boundary in the Atlantic Ocean?

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Question 92.5 pts

Compare the distribution and depths of earthquakes shown for the mid-Atlantic plate boundary (see questions 3 & 4) and the Tonga-Kermadec boundary shown

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Question 102.5 pts

Describe the distribution of earthquakes at the Tonga-Kermadec plate boundary

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Question 112.5 pts

What is the explanation for earthquakes at these locations and depths at the Tonga plate boundary?

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Question 122.5 pts

Note where the shallowest earthquakes are located along the Tonga plate boundary. What is this feature called?

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Question 132.5 pts

Approximately what is the depth of earthquakes that are spatially related to the active volcanoes along the Tonga plate boundary?

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Question 142.5 pts

Is the relationship between earthquake depth and active volcanoes similar here?

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Question 152.5 pts

How about in Central America (Guatemala, El Salvador, Nicaragua, etc.)?

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Question 162.5 pts

What is the dominant type of plate boundary along the Ring of Fire?

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Question 172.5 pts

Is crust being created or destroyed at this plate boundary?

West Atlantic Ocean at the easter South American boundary

Explanation / Answer

Answer 12: Mid-Atlantic ridge in the Mid-Atlantic ocean.

Explanation: The boundary that separates the South American and African plates is the southern part of the Mid-Atlantic ridge which is a constructive plate boundary.

Answer 22: Divergent.

Explanation: The Mid-Atlantic ridge is a divergent plate boundary along which new crustal material is being created and hence is also known as constructive plate boundary.

Answer 32: On the Mid-Atlantic ridge.

Explanation: The ever spreading Mid-Atlantic ridge which is a string of mountains that run along a tectonic rift system on the crust is thre main reason and the site of occurence of most of the earthquakes in the Atlantic ocean.

Answer 42: Shallow.

Explanation: Earthquakes associated with divergent plate boundaries such as the Mid-Atlantic ridge are usually shallow earthquakes while those associated with subduction zones are the deepest.

Answer 52: 0 Ma

Explanation: At the plate boundary at the Mid atlantic ridge, new crust is being created continuously by the rising mantle material. They are the most recent of any other crust and thus they are 0 Ma years old.

Answer 62: it gets older.

Explanation: The newest seafloor occurs just at the center of the mid oceanic ridge and the age, density and thickness of the oceanic crust increases with increasing distance away from the mid oceanic ridge.

Answer 72: Mid-Atlantic plate boundary is the deepest part of the ocean and has the youngest seafloor in age.

Explanation: The Mid-Atlantic ridge has a system of deep rift valley and because new crust is being created here by the rising mantle material, it has the youngest seafloor.

Answer 82: Created.

Explanation: The boundary is a constructive plate boundary where the rising mantle material is creating new crust.

Answer 92: Mid atlantic plate boundary earthquakes are shallower than Tonga-Kermadec plate boundary earthquakes.

Explanation: Tonga Kermadec plate boundary is a convergent plate boundary along which subduction occurs and thus this plate boundary is associated with some of the deepest earthquakes.

Answer 102: Earthquakes get deeper to the east.

Explanation: The eastern boundary of the Tonga plate is the fastest subduction zone which is associated with a greater number of earthquakes.

Answer 112: Earthquakes occur at the locations/depths because the Pacific plate subducts beneath the Australian plate.

Explanation: The Tonga Kermadec plate boundary in the Pacific ocean is bounded by the pacific ocean to its east which is being subducted beneath the Australian plate giving rise to many earthquakes and volcanoes.

Answer 122: Mid ocean ridge.

Explanation: Mid oceanic ridges have shallower crusts and hence are associated with shallow earthquakes.

Answer 132: 400 km

Explanation: Earthquakes along subduction zones are usually deep focus earthquakes ranging in depths between 300-600km.

Answer 142: Yes

Explanation: The active volcanoes and the earthquakes have a similar relationship and they occur along and define the subduction zones that surround the Pacific ocean.

Answer 152: No

Explanation: Central America mainly consists of a volcanic arc which is formed by an active subduction zone with little or few earthquakes. They do not have a similar relationship.

Answer 162: Convergent

Explanation: The Ring of fire is the area surrounding the pacific ocean where the oceanic lithospheric plate is being subducted beneath the continental plates along the convergent plate boundaries giving rise to numerous volcanic activities and earthquakes.

Answer 172: Destroyed.

Explanation: At convergent plate boundaries, one lithospheric plate is subducted beneath another resulting in their destruction.

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